Furnace-stoker.



P. L. GROWE.

FURNACE STOKER.

APPLICATION FILED JAN. 23, 1909.

1,000,587 Patented Aug.15,1911.

, 2 SHEETS-SHEET 1. 5 1,

.2. L. GROWE. FURNACE STOKEB. APPLIOATIONFILBD JAN. 23, 1909.

Patented Aug. 15, 1911. 2 sums-11152.

Eva 5 die 17 PAUL L. CROWE, OF JERSEY CITY, NEW JERSEY.

FURNAGE-STOKER.

Specification of Letters Patent.

Patented Aug. 15, 1911.

Application filed January 23, 1909. Serial No. 473,894.

To all whom it may concern:

Be it known that I, PAUL L. C-RowE, citizen of the United States, andresident of Jersey City, in the county of Hudson and State of NewJersey, have invented certain new and useful Improvements in Furnace-Stokers, of which the following is a specification.

My invent-ion relates to furnace stokers, and the object is to providestokers of this class with certain new and useful means which willincrease the combustion of fuel and smokelessness, raise the fuelsurfaces in.

their central portions and augment the efficiency of the furnace.

Referring to the drawing: Figure 1 is a sectional elevation of a part ofa furnace stoker showing my improvements applied thereto. Fi 2 is asectional elevation on line mm Fig. 1, showing my improvements appliedto a single arch looking in direction of arrow. Fig. 3 is anothersectional elevation showing my improvements applied to a single arch oflarger radius. Fig. 4 is a plan sectional view on line y-z, Fig. 2,showing only the top of the angle grate supports and the offsets in theside walls. Fig. 5 is another plan sectional View showing in additionthe top of the grate sections. Fig. 6 is another cross sectionalelevation showing my improvements applied to a furnace stoker having a.double arch. Fig. 7 is a detached side view of one of the gratesections. Fig. 8 is a plan view of the grate sections partly in section.Fig. 9 is an inside view of the pusher plate, detached. Fig. 10, is afront view of one of the grate bars detached. Fig. 11 is a detachedfront view of the fuel regulating plate. Fig. 12 is a cross sectionalview of the delivery plate detached. Fig. 13 is a view of a part of thefurnace front showing fuel port and clinker blocks in dotted lines.

2 is the furnace, 3 the arch. This arch is preferably made with astraight or flat front portion and is made more crown shaped toward therear portion. The arch is mounted within the furnace preferably at anincline toward the center of the combustion chamber. Below this arch atthe front part of the furnace is located the distributing plate 4; saidplate is formed as shown in Figs. 2 and 12, higher at the center that atthe ends. Above this distributing plate 1- is positioned the fuelregulating plate 5 with a concave surface. These coacting plates form asufficient opening for the passage of the fuel required. Below thedistributing plate 4 are pivotally mounted the rocking grate bars 6,each having its central portion higher than the ends (see Fig. 10).These grate bars rest at their outer ends in the sockets 7 formed in thesupporting plates 8 which are fastened on the inside of the front plateB of the furnace. 10 is the operating bar, suitably supported andprovided with a plurality of rests for the stems A of the grate bars tooscillate in. The upper end of this bar is pivotally connected to thestem A of the first of the series of grate bars, and also pivotallyconnected to the rod 11 of the operating mechanism 12 to be hereinafterdescribed.

Upon the rocking grate bars are mounted the grate sections 14;, each ofwhich is provided with a shouldered groove 15 which permits the sectionsto be slid upon the flange 17 of the supports. The groove 15 is furtherextended inward where it is offsetted to shoulder against the downwardprojection of the supporting flange. When the sect-ions are positionedthey are first set over the flange, and drawn forward until they dropinto their normal position as seen in Fig. 1. The sections are alsoprovided with an offset 18, on each side, which is so arranged thatwhenthe sections are laid side by side spaces 19 will be formed betweenthe outer ends of the sections serving as air passages (see Figs. 58).

The groove 15 may be of any suitable form so as to cooperate with anyshape that may be given the supporting bar 6. The grate sections arevalso provided with projections 20 formed on one side and a recess 21formed on the other side. When the grate sections are united theprojections will enter the recesses (see Figs. 78), thereby keeping thesections in a uniform position. When all the sections are positionedtogether on the angle supports they will form a single grate bar 26. Theouter ends 23 of the sections of the bars project above the supportingplate 8, thereby forming along with the offsets on the side walls 37pockets 28.

The object of arranging the grate bars higher in the central portionthan at their ends is to thicken the layers of fuel at the outer endsofthe bars for the reason that the radiation of the side walls isgreater when contiguous thereto which tends to consume the fuel morerapidly.

At the ends of fuel port between the distributing plate 4 and theregulating plate 5, are located the clinker blocks 29 made of metal andpositioned back of the front plate B in the offsets 37 of the side walls9 (see Fig. 13) and set above and upon the said distributing plate.

Fig. 2 shows a single arch and a'view of a single set of bars. 7

Fig. 3 shows a single arch, and two sets of grate bars with but littlecurve meeting each other in the central portion of the furnace in araised condition for complying with the requirements of a wide furnacehaving a single arch.

Fig. 6 shows how the longitudinal beveled grate bars are arranged in aduplex furnace having duplex arches. There may be any number of gratesupports 6 placed in a furnace as shown.

The connecting rod 11 is pivotally connected to the rocking arm 30 whichis pivoted to the hopper 31. This rocking arm is connected to aneccentric 32 by the rod or arm 33, said eccentric mounted on the drivingshaft 34:, which is suitably mounted and operated. As the rocking arm 30vibrates it will move the pusher plate 35, and the delivery plate 36,which is connected to said pusher. The lower portion of said pusher islongitudinally beveled or curved, and the distributing plate 4 is alsolongitudinally beveled (see Fig. 6).

The grate sections 1% of the bars 6 are easily removed and replaced atany point between the walls of the furnace. The parts can be made ofcast iron, but wrought iron is preferable.

The walls 9 of the furnace are at the ends of the grate surfaces. 37 arethe offsets. These offsets are preferably below the grate surfaces. Inconjunction with the grate sections these offsets present pockets 28which will fill with the ashes and refuse and prevent clinkers formingon the side walls, and keep the heat from the supporting plates. Thisconstruction of the side walls in practice is adapted to the conditionsof smoke prevention and tends to insure the life of the walls.

WVhat I claim is: p v I 1. In a stoker mechanism a furnace similarlypositioned inclined supporting plates mounted at opposite sides of andwithin said furnace, rocking grate bars transversely arranged withrespect to and mounted on said inclined supporting plates, each of saidrocking bars having its upper supporting portion inclined toward itsends from a point intermediate its ends and grate sections mounted onsaid grate bars.

2. In a stoker mechanism, a furnace, similarly positioned inclinedsupporting plates with socket rests mounted at opposite sides of andwithin said furnace, rocking grate bars having flanges, and transverselyarranged with respect to and mounted on said inclined supporting plateswithin the socket rests thereof, each of said rocking bars having itsupper supporting portion inclined .toward its ends from a pointintermediate .the

latter, and grate sections having shouldered grooves, and mounted onsaid grate bars, the flanges thereof resting in the grooves of saidgrate sections, an operating bar located beneath said gratebars, one ofsaid grate bars pivoted to said operating bar, the others looselyresting upon said bar and means for actuating the operating bar.

3. In a stoker mechanism, the combination of a furnace, the side wallsof said furnace being provided with ash receiving pockets, of a stokergrate mounted in said furnace, said grate comprising transverselyarranged rocking bars, the fuel-supporting surfaces of said bars beinginclined toward the ends, from a point intermediate the ends, and meansfor rocking said bars whereby ashes are moved outwardly along thefuelsupporting surfaces of said grate bars into the ash receivingpockets formed in the side walls of the said furnace.

Signed at Jersey City, in the county of Hudson and State of New Jersey,this 20th day of January A. D. 1909.

PAUL L. GRO'WE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

